Message in Chinese (Simplified) (中文(简体))
实体类型“<var>Type Name</var>”上定义的关联“<var>X</var>”无效。它是外键关联，但属性类型不是单一实例。
Unlocalized message
Association '<var>X</var>' defined on entity type '<var>Type Name</var>' is invalid. It is a foreign key association but the property type is not a singleton.
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